Production of a sound track with anti-foggant in the redeveloper solution

ABSTRACT

A method for producing a sound track on a photographic silver halide type colour material wherein after bleaching the silver contained in the colour-developed material, only the sound track area of the material is treated with a redeveloper composition comprising a developing agent and an organic heterocyclic compound containing in a 5- or 6-membered heterocyclic ring a structural part corresponding with one of the following tautomeric structural groups.

United States Patent [191 Vandeputte et al.

[4 1 Dec. 17, 1974 PRODUCTION OF A SOUND TRACK WITH ANTI-FOGGANT IN THE REDEVELOPER SOLUTION Inventors: Camille Angelina Vandeputte,

Mortsel; Roger Joseph Huybrechts, Brussel, both of Belgium; Daniel Jean Gallois, Paris, France; Roland Gaston Verbrugghe, Mechelen, Belgium Assignee: AGFA-Gevaert, Mortsel, Belgium Filed: Nov. 24, 1972 Appl. No.: 309,120

Foreign Application Priority Data Nov. 26, I971 Great Britain 55093/7l US. Cl. 96/4, 96/39 Int. Cl G03c 4/24, GO3c 5/14 Field of Search 96/4, 39

References Cited UNITED STATES PATENTS 9/l973 Walsh 96/4 Mannes et al. 96/22 Guell 96/4 Primary ExaminerDavid Klein Assistant Examiner- Richard I... Schilling Attorney, Agent, or Firm-William J. Daniel [57] ABSTRACT 4 Claims, No Drawings PRODUCTION OF A SOUND TRACK WITH ANTl-FOGGANT IN THE REDEVELOPER SOLUTION This invention relates to a process for the production of a sound track on a colour film and to a colour film comprising a sound track produced by said process.

It is known to produce a sound track on a colour film by a process containing the following steps in subsequent order. p

A photosensitive silver halide film material suited for the production of colour images by a known reversal processing method is exposed to a pattern of imagewise modulated electromagnetic radiation. Simultaneously with or subseqeuntly to the image-wise exposure the film is exposed in its area intended for carrying the sound track through a negative sound track original. The sound track and picture areas are developed in the usual way in a normal black-and-white developer to produce negative silver images in the picture areas and a positive sound track record in the sound track areas of the film.

Optionally the film is then treated with a stop bath and rinsed.

After having been dried the film is overall exposed to white light and thereupon only its sound track areas are treated with a fixing composition. This may be accomplished e.g. by dipping the edge of the film containing the developed sound track area into a fixing solution or by applying to said area a viscous fixing liquid, e.g. in the form of a paste that is only deposited at the sound track area. The film is then washed and the silver halide that has been treated in the sound track areas by the fixing composition is removed, the non-developed silver halide of the picture area remaining unaffected.

The film then continues through its regular processing for the production of reversed colour images in the picture area of the film by colour development of the re-exposed picture areas. The re-exposure of the film may proceed before or after the fixing of the sound track picture. Optionally the colour developed film is then rinsed, fixed and rinsed again.

Subsequently the colour developed and fixed film is treated with a solution containing a substance or substances that re-oxidize(s) the developed silver, which results in the bleaching of the silver in the picture as well as in the sound track areas. For this purpose e.g. an aqueous alkaline bleaching solution containing cyanoferrateflll) ions e.g. originating from an alkaline metal cyanoferrate(lll) compound and containing halide ions e.g. originating from an alkaline metal halide may be used.

In order to remove the ingredients of the bleaching solution the film is rinsed and dried.

Only then the sound track areas are subjected to a redevelopment with a reducing agent producing a positive silver metal sound track print. The film is then rinsed and subjected to a fixing treatment, whereby the silver compounds obtained in the bleaching step are removed from the picture areas, and the surplus of redeveloper in the sound track is removed therefrom by washing.

Finally the film is rinsed and optionally treated with a hardening substance for the colloid binder and optionally with a stabilizing substance for the dyes of the recording layer(s).

Unfortunately, the positive sound track produced according to said process shows highlights that are not so clear so that the signal to noise ratio of the sound reproduction is not of high quality.

The fog in the highlights, which is produced when said process is carried out, is built up by randomly distributed silver metal agglomerates of different size so that a varying granularity of fog gives rise to a background noise, which itself is more or less modulated.

It has been found now that the optical transparency of the highlights of the sound track can be improved by modifying the above process in such a way that the redevelopment of the sound track is carried out with a composition containing a developing agent and an organic fog-inhibiting compound.

In a preferred embodiment of producing a positive sound track according to the present invention on a multilayer photographic silver halide colour film of the reversal type, the complete processing of such a film proceeds according to the following steps:

1. exposing the photosensitive film to a pattern of imagewise modulated electromagnetic radiation,

2. simultaneously or subsequently to said image-wise exposure photo-exposing the film in its area intended for the sound track through a negative sound track original,

3. black-and-white developing the film in order to produce negative silver images in the picture areas and a positive sound track record in the sound track area of the film,

4. treating the sound track area with a fixing composition that complexes the residual silver halide in this area,

5. re-exposing the film to visible light, the reexposure being performed after step 3 or 4,

6. washing the thus treated film, thereby removing the complexed silver halide of the sound track area and leaving the non-developed silver halide of the picture areas unaffected,

7. colour-developing the film,

8. rinsing,

9. overall fixing whereby the possibly still present undeveloped silver halide is complexed and removed, leaving the colour-developed picture unaffected and having no effect on the sound track area, 1

l0. treating the colour-developed film with a substance or substances that re-oxidize the developed silver which results in the bleaching of the silver of the picture as well as of the sound track area,

1 l. removing the surplus of the bleaching substance or substances and its (their) water-soluble reaction products by rinsing and drying the film,

l2. subjecting only the sound track area to a redevelopment with a developer solution comprising a developing agent and a fog-inhibiting compound,

13. rinsing the film and removing the silver compounds obtained in the bleaching step from the picture areas by a fixing treatment with a complexing agent,

14. optionally treating the processed film with a colloid hardening agent and/or a colour-stabilizing agent.

The transparency of the highlights can be improved by carrying out the redevelopment in the presence of an organic fog-inhibiting compound.

Particularly suitable fog-inhibiting compounds for use in the redeveloper composition to improve the signa] to noise ratio are organic heterocyclic compounds containing in. a 5- or 6-membered heterocyclic ring a structural part corresponding with one of the following tautomeric structural groups:

Preferred heterocyclic compounds for use as foginhibiting compounds containing a 5- or 6-membered heterocyclic ring, are:

A2-1 ,2,4-triazoline-5-thione,

3-amino-A2- 1 ,2,4-triazoline-5-thione,

HzN 7=s LN'H 5-amino-A4- l ,3,4-oxadiazoline-2-thione,

NNH

5-amino-A4- l ,3 ,4-thiadiazoline-2-thione,

HNNH

1,3 ,4-thiadiazolidine-2,5-dithione,

3-methyll ,3,4-thiadiazolidine-2,5-ditione,

O NH

2-thio-tetrahydro-l ,3-thiazine-2,4-dione,

4 5 ,5-dimethyl-2-thio tetrahydro-l ,3-thiazine-2,4-

dione,

l[ N [1.10 v: s

| Clix 4,6-dimethyll ,Z-dihydro-pyrimidine-Z-thione,

N int: i s

6-methyl-2-thiol ,2,3 ,4-tetrahydro-pyrimidine-2,4-

dione,

6-amino-2-thio- 1 ,2,3 ,4,-tetrahydropyrimidine-2,4-

dione, and

HrNUS I NH2 wherein X is NH-, -O, or -S--, and Z represents the atoms necessary to close a 5- or 6-membered ring having only hydrogen, =S, =0, amino and lower alkyl substituents thereon.

The concentration of the fog-inhibiting compound used according to the present invention preferably varies between 0.1 and 5 g per litre of developer solution.

A suitable concentration ranges from about 2 to 3 g per litre of developer solution if no silver halide complexing agent is present in the developer solution, and from about 0.2 to 0.5 g per litre of developer solution, if a silver halide complexing agent is present.

in combination with such an organic fog-inhibiting agent a developing agent known for use in a black-andwhite developer is used. The development of sound recordings has been described e.g. by P. Glafkides in Photographic Chemistry Fountain Press London (1958) 261-262 and 264-265. Preferably an energetic developer is used for variable area recordings e.g. a developer containing hydroquinone as the sole developing agent. The developer composition may contain other ingredients common to black-and-white silver halide developers e.g. an anti-oxidizing agent, a wetting agent, development accelerating compounds, alkaline substances, a pH-controlling agent, a silver complexing agent, a toning agent, and a viscosity-controlling agent. More particularly substances such as sulphites, an alkaline metal carbonate, potassium bromide, borates, ethylene diamine, an alkali-soluble polyoxyalkylene compound e.g. a polyoxyethylene glycol, a polyol such as e.g. a hexylene glycol and a thickening agent such as a water-soluble cellulose derivative,. e.g. hydroxyethylcellulose.

The application of the redeveloper composition to the sound track area may be accomplished in any convenient manner such as by passing the edge of the film bearing the redevelopable sound track image through a bath containing the developing agent and the foginhibiting agent or by applying a viscous liquid or paste to such area e.g. by means of a roller wetted with a said developer composition. The period of time and the temperature that the sound track portion of the film is in contact with the redeveloper composition depends on the activity of the developing agent, the pH of the developing medium and the concentration of ingredients that speed up or retard the development.

The contact time, the temperature, and the concentration should be adjusted to obtain the desired optical density in the photoexposed portions and an almost complete transparency in the highlights of the sound track.

Particularly good results are obtained with contact times of 20 to 40 seconds at a temperature of 23C using one of the developing compositions as described in detail hereinafter.

Composition 1 gvtnmuntm AZ-l.2,4-triazoline-5-thione has been prepared as described in Organic Synthesis 40. )9.

Composition 2 hydroquinone sodium sul hite sodium h roxide S-aminol ,2,4-triazoline-5-thione ethylene diamine co ilymer of methyl vinyl ether and a h f amide of maleic acid/molar ratio 50:50 average molecular weight 30.000

water to make 1000 ml 3-amino-A2-l.2.4-triuzoline-5-thiune has been prepared according to example 6 of the United Kingdom Patent Specification 737,568 filed June ll, I952 by llford Limited The present invention is suited for the reproduction of all types of variable area sound tracks, preference 6 being given, however, to the printing of a sound track from a negative sound track. Different types of variable area sound track negatives and their production are described e.g. by P. Glafkids, in Photographic Chemistry Vol. I Fountain Press London (1958) 258-262.

The process of the present invention is especially advantageous for producing a sound track on a multilayer photographic colour film of the reversal type having superposed emulsion layers sensitive to different regions of the visible spectrum and of which one area is reserved for photographic sound track recording and another area is reserved for picture recording e.g. in the form of the picture frames of a colour motion picture film. Reversal type multicolour photographic films and their processing have been described e.g. by P. Glafkids in his above mentioned book, vol. I], on pages 615-626 and in the United States Patent Specification 2,252,718 of Leopold D. Mannes, Leopold Godowsky and Lot S. Wilder, issued Aug. 19, 1941.

A reversal-type multilayer colour print film permitting the printing of a sound track from a negative sound track as well as from a positive is e.g. the Gevachrome Print Film Type 9.02 of A'GFA-GEVAERT N.V., which film is suited for printing release copies from colour reversal originals as described in the Journal of the S.M.P.T.E. December l967 and the technical bulletin of Agfa-Gevaert N.V., Belgium, relating to such film and published January 1968.

The process of the present invention and the obtained improvement are illustrated by the following examples. The percentages are by weight unless otherwise indicated.

EXAMPLE l A reversal colour print film composed of a transparant resin support was coated in subsequent order on its front side with:

l. a gelatin subbing layer,

2. a red-sensitive silver halide emulsion layer containing a colourless colour coupler for producing a cyan dye,

3. a magenta dye filter layer,

4. a green-sensitive silver halide emulsion layer containing a colourless colour coupler for producing a magenta dye,

5. a yellow dye filter layer,

6. a blue-sensitive silver halide emulsion layer containing a colourless colour coupler for producing a yellow dye,

7. a gelatin top coat serving as antistress layer.

The rear side of the resin support was coated with an antihalation layer containing carbon black.

The resulting film was contact-exposed through a colour film containing positive multicolour picture frames and synchronically exposed through a variable area negative sound track of a master film. The exposed print film was then developed for 2 minutes in a black-and-white developer of the following composition:

808m N8 common as;

- -Continued potassium thiocyanate l potassium bromide 0.1 aqueous solution of potassium iodide water to make 1 pH: 10.2.

as. "a.

The so developed film was then treated for 2 minutes in a stop-bath of the following composition:

water 900 ml potassium alum 15 g lacial acetic acid 10 ml rax 21 g water to make 1000 ml pH 43 After having been rinsed for 1 minute, the film was squeegeed and re-exposed to white light to fog the undeveloped silver halide. A fixing paste was applied only to the sound track areas by means of an applicator roller. Said fixing paste had the following composition:

water 600 ml ammonium thiosulphate 400 g a copolymer of methyl vinyl ether and the half-amide of maleic acid (molar ratio 50/50 average molecular weight 30,000) 8 g water to make 1000 ml After having been rinsed for IV: minute, the film was colour-developed for minutes in a colour-developer of the following composition:

water to make P water 700 ml anhydrous sodium thiosulphate 200 g sodium hydrogen sulphite 12 g lacial acetic acid 12 ml rax 20 g potassium alum 15 g water to make 1000 ml After having been rinsed for 1 minute, the film was bleached for 2 minutes in the bleaching solution of the following composition:

water 900 ml potassium cyanoferrateflll) 75 g potassium bromide 15 g glacial acetic acid ml sodium acetate 5 g potassium alum g water to make pH 3.9

After rinsing of the sound track for 1 minute, one part of the film was taken to redevelop the sound track in a redeveloper A without a fog-inhibiting agent, whereas another part of the film was taken to redevelop the sound track in a developer B containing a foginhibiting agent.

Composition of redeveloper A hydroquinone sodium sulphite sodium hydroxide ethylene diamine a copolymer of methyl vinyl ether and a half amide of maleic acid (molar ratio 50/50 average molecular weight 30,000)

water to make MNO c008 gmqarn s 1000ml Composition of redeveloper B hydroquinone sodium sulphite sodium hydroxide ethylene diamine a copolyrner of methyl vinyl ether and a half amide of maleic acid (molar ratio 50/50 average molecular weight 30,000)

3-amino-A2- 1 ,2,4triazo1ine-S-thione water to make 1 it ease B NGO (NUQUQUQ After the redevelopment of the sound track the film was rinsed for 1 min. and treated for 2 min. in a fixing solution having the following composition:

water 700 ml anhydrous sodium thiosulphate 200 g sodium hydrogen sulphite 12 g glacial acetic acid 12 ml borax 20 g potassium alum 15 g water to make 1000 ml Finally the fixed film was rinsed and dried.

The whole processing was carried out a temperature of 25C.

The sensitometric values of the sound track records obtained when using the redevelopers A and B are given hereinafter.

The Fog" represents the optical density in the clear areas of the sound track.

The Maximum Density is the optical density of the opaque areas of the sound track.

The Average Gradient is the slope of the straight line connecting the point of the characteristic curve having the absolute density 1.4 with the point of the curve being situated 0.6 log it away towards the lower densities.

oper G and the redeveloper B was replaced by a rede- EXAMPLE 2 veloper l-l having the following compositions respec- Example 1 was repeated with the difference, howtively. ever, that the redeveloper A was replaced by a redeveloper C and the redeveloper B was replaced by a rede- 5 veloper D having the followmg compositions respec- Redeveloper G tively.

hydroquinone 6O 8 sodium sulphite 75 g 10 hgiimide 2 5 l et ene amme m Redeveloper C sodium alginate 4 g water to make l000 ml hydroquinone 50 g Redevelo r H sodium sulphite 40 g sodium hydroxide 20 g y f q 60 g eth lene diamine ml sodlum sul 75 g hy roxyethylcellulose 12 g 15 S0dlumh rQXlde 80 g water to make i000 ml ethylene amine 25 ml Redevelo rD sod|u ma.l nate 4 g hydroquinone 50 g g-ahrnrrilg- 4-l,3,4-thiadiazolme- 3 g sodium sulphite 40 g Sodium hydroxide g water to make l000 ml gthylene dliarnine 15 ml ydroxyet ycellulose 12 g sodium thiosul hate 30 g 20 A2-l,2,4-triazoine-5-thione 250 mg Sens1tometric values water to make 1000 Average Redeveloper Fog gradient Maximum density Sensrtometric values G 016 090 28 H 0.08 0.90 l.l8 Average Redeveloper Fog Gradient Maximum density c 0.16 0.90 1.28 D 0.04 0.85 1.04 30 EXAMPLE 5 Example 1 was repeated with the difference, however, that the redeveloper A was replaced by a redevel- EXAMPLE 3 oper J and the redeveloper B was replaced by a redevelo er K havin the followin com ositions res ec- Example l was repeated with the difference, howfive]? g g p p ever, that the redeveloper A was replaced by a redeveloper E and the redeveloper B was replaced by a redeveloper F having the following compositions respec- RedeveloperJ tivel y hydroquinone 60 g sodium sul hite 60 g sodium hy roxide 20 g ethylene diamine 20 ml Redeveloper E a copolymer of methyl vinyl ether :(md la halfgf maleic acid h inone 60 moar ratio average g m hite 75 2 molecular weight 30,000) 8 g Sodium hy roxide 30 g water to make 1000 ml ethylene diamine 25 ml EE K sodium alginate 4 g hydroquinone 60 g water to make I000 ml sodium sul hite 60 g Redeveloper F sodium h oxide 20 g hydroquinone 60 g ethylene amine 20 1 sodium sul hit 75 g a copolymer of methyl vinyl ether sodium h roxide 80 g and a half amlde of maleic acid ethylene iamine 25 ml (m lar ratio 50/50 average sodium a] inate 4 g molecularwei t30,000) 8 g 4.6-dimet yl-l,2-dihydro-pyrimi- 4 g sodium thios phate 20 g dine-Z-thione A-2-l,2,4-th|azol|ne-5-thtone 200 m water to make 1000 ml water to make I000 m Sensitometric values Sensitometric values Average Average Redeveloper Fog gradient Maximum density Redeveloper Fog gradient Maximum density E 0.16 0.90 1.28 .l 0.16 0.90 1.28 F 0. lo 0.90 1.22 K 0.06 0.95 1.20

EXAMPLE 4 EXAMPLE 6 Example I was repeated with the difference, how ever, that the redeveloper A was replaced by a redevel- Example 5 was repeated with the difference, however, that the redeveloper A was replaced by a redeveloper L and the redeveloper B was replaced by a redeveloper M having the following compositions respectively:

Redeveloper L hydroquinone sodium sul hite sodium hy roxide ethylenle diamitne m l th acopoymero me y vin le er and a half amide of maleic acid (molar ratio 50:50 average molecular weight 30,000)

water to make Redevelo r M hydroquinone sodium sul hite sodium hy roxide ethylene diamine 3-amino-A2- l ,2,4-triazoline- S-thione a copolymer of methyl vinyl ether and a half amide of maleic acid (molar ratio 50:50 average molecular weight 30,000) water to make it a ease s ease,

Sensitometric values Redeveloper Fog Average Maximum density gradient 0. l 6 l .00 0.04 l .06

wherein X is -NH-, -O, or S, and Z represents the atoms necessary to close a 5- or 6-membered ring having only hydrogen, =S, =0, amino and lower alkyl substituents thereon.

2. Method according to claim 1, wherein a sound track is produced on a photographic silver halide colour film by applying a reversal processing containing the following steps:

l. exposing the photosensitive film to a pattern of image-wise modulated electromagnetic radiation,

2. simultaneously or subsequently to said image-wise exposure photo-exposing the film in its area intended for the sound track through a negative sound track original,

3. black-and-white developing the film in order to produce negative silver images in the picture areas and a positive sound track record in the sound track area of the film,

4. treating the sound track area with a fixing composition that complexes the residual silver halide in this area,

5. re-exposing the film to visible light, the reexposure being performed after step 3 or 4,

6. washing the thus treated film, thereby removing the complexed silver halide of the sound track area and leaving the non-developed silver halide of the picture areas unaffected,

7. colour-development of the film,

8. rinsing,

9. overall fixing whereby the possibly still present undeveloped silver halide is complexed and removed, leaving the colour-developed picture unaffected and having no efiect on the sound track area,

l0. treating the colour-developed film with a substance or substances that reoxidize the developed silver, which results in the bleaching of the silver of the picture as well as of the sound track areas,

ll. removing the surplus of the bleaching substance or substances and its water-soluble reaction products by rinsing and drying the film,

l2. subjecting only the sound track area to a redevelopment with the developer solution of claim 1 l3. rinsing the film and removing the silver compounds obtained in the bleaching step from the picture areas by a fixing treatment with a complexing agent,

14. optionally treating the processed film with a colloid hardening agent and/or a colour stabilizing agent.

3. Method according to claim 1, wherein said organic heterocyclic compound is at least one of the following compounds:

A2- l ,2,4-triazoline-5-thione,

3-amino-A2-l ,2,4-triazoline-5-thione,

5-amino-A4-l ,3 ,4-oxadiazoline-Z-thione,

5-amino-A4-l ,3 ,4-thiadiazoline-Z-thione,

l,3,4-thiazolidine-2,S-dithione,

3-methyll ,3 ,4-thiadiazolidine-2,5-dithione,

5,S-dimethyl-2-thio-thiazolidine-2,4-dione,

Lthio-tetrahydrol ,3-thiazoline-2,4-dione,

5 ,5-dimethyl-2-thio-tetrahydrol ,3-thiazine-2 ,4-

dione,

4,6-dimethyl-l ,2-dihydro-pyrimidine-2-thione,

6-methyl-2-thiol ,2,3 ,4-tetrahydro-pyrimidinc-2 ,4-

dione,

6-amino-2-thio-l ,2,3,4-tetrahydro-pyrimidine-2,4-

' dione-, and

4,6-diamino-l ,2-dihydro-pyrimidine-2-thione.

4. Method according to claim 1, wherein the concentration of the organic heterocyclic compound varies between 0.l and 5.0 g per litre of re-developer solution. 

1. IN A METHOD FOR PRODUCING A SOUND TRACK ON A PHOTOGRAPHIC SILVER HALIDE TYPE COLOR MATERIAL WHEREIN AFTER BLEACHING THE SILVER CONTAINED IN THE COLOR-DEVELOPED MATERIAL, ONLY THE SOUND TRACK AREA OF THE MATERIAL IS TREATED WITH A REDEVELOPER COMPOSITION AND THEN THE ENTIRE MATERIAL IS RINSED AND SUBJECTED TO A FIXING TREATMENT TO REMOVE THE SILVER COMPOUNDS REMAINING AFTER BLEACHING, THE IMPROVEMENT OF USING A REDEVELOPER COMPOSITION COMPRISING A DEVELOPING AGENT AND A FOG-INHIBITING ORGANIC HETEROCYCLIC COMPOUND HAVING THE FOLLOWING STRUCTURAL FORMULA OR A TAUTOMERIC FORM THEREOF:
 2. Method according to claim 1, wherein a sound track is produced on a photographic silver halide colour film by applying a reversal processing containing the following steps:
 2. simultaneously or subsequently to said image-wise exposure photo-exposing the film in its area intended for the sound track through a negative sound track original,
 3. black-and-white developing the film in order to produce negative silver images in the picture areas and a positive sound track record in the sound track area of the film,
 3. Method according to claim 1, wherein said organic heterocyclic compound is at least one of the following compounds: Delta 2-1,2,4-triazoline-5-thione, 3-amino- Delta 2-1,2,4-triazoline-5-thione, 5-amino- Delta 4-1,3,4-oxadiazoline-2-thione, 5-amino- Delta 4-1,3,4-thiadiazoline-2-thione, 1,3,4-thiazolidine-2,5-dithione, 3-methyl-1,3,4-thiadiazolidine-2,5-dithione, 5,5-dimethyl-2-thio-thiazolidine-2,4-dione, 2-thio-tetrahydro-1,3-thiazoline-2,4-dione, 5,5-dimethyl-2-thio-tetrahydro-1,3-thiazine-2,4-dione, 4,6-dimethyl-1,2-dihydro-pyrimidine-2-thione, 6-methyl-2-thio-1,2,3,4-tetrahydro-pyrimidine-2,4-dione, 6-amino-2-thio-1,2,3,4-tetrahydro-pyrimidine-2,4-dione-, and 4,6-diamino-1,2-dihydro-pyrimidine-2-thione.
 4. Method according to claim 1, wherein the concentration of the organic heterocyclic compound varies between 0.1 and 5.0 g per litre of re-developer solution.
 4. treating the sound track area with a fixing composition that complexes the residual silver halide in this area,
 5. re-exposing the film to visible light, the re-exposure being performed after step 3 or 4,
 6. washing the thus treated film, thereby removing the complexed silver halide of the sound track area and leaving the non-developed silver halide of the picture areas unaffected,
 7. colour-dEvelopment of the film,
 8. rinsing,
 9. overall fixing whereby the possibly still present undeveloped silver halide is complexed and removed, leaving the colour-developed picture unaffected and having no effect on the sound track area,
 10. treating the colour-developed film with a substance or substances that reoxidize the developed silver, which results in the bleaching of the silver of the picture as well as of the sound track areas,
 11. removing the surplus of the bleaching substance or substances and its water-soluble reaction products by rinsing and drying the film,
 12. subjecting only the sound track area to a redevelopment with the developer solution of claim 1
 13. rinsing the film and removing the silver compounds obtained in the bleaching step from the picture areas by a fixing treatment with a complexing agent,
 14. optionally treating the processed film with a colloid hardening agent and/or a colour stabilizing agent. 